Simulation analysis of variable speed pump-control-motor hydraulic system

Variable speed hydraulic drive system is a new type energy saving system. Simulation analysis was carried out for the variable speed pump-control-motor hydraulic system. Mathematic models of inverter, asynchronous motor, fixed pump and load were set up. The compound closing control technology of PID control, input feedforward and load feedforward were applied in the simulation. The simulation results shows that this control strategy can solve the problems of low speed stiffness and poor control performance in the system.